HDFS-6712: Merging r1612695 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1612696 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6703. Merging change r1612702 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1612705 13f79535-47bb-0310-9956-ffa450edef68